Suet cakes are usually fed to wild birds as packed nutritional food bricks in square form. Historically, suet cakes contain meat mixed with other supplements popular with birds. They are placed inside suet cake feeders, and then on trees.
Birds can access these suet cakes by perching on the tree and pecking on the suet cake. Occasionally, small pieces will fall to the ground, and more birds can feed on those scraps.